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Tutor profile: Sireesha K.

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Sireesha K.
Math tutor
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Questions

Subject: Geometry

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Question:

A surveyor is mapping a triangular corn field. He measures the lengths of two of the sides of the corn field are 450 yards and 320 yards and the included angle is 80°. What is the measure of the third side of the corn field, to the nearest yard?

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Sireesha K.
Answer:

As two side lengths and an included angle are given and asked to find third side length use law of cosines. Law of cosine: c^2=a^2+b^2-2abCos(C), where a, b and c are the side lengths and C is the included angle of the sides a and b. Substitute the values we know: 450^2+320^2 - 2(450)(320)Cos(80) Simplifying we get the length of the third to the nearest yard is 505 yards.

Subject: Pre-Algebra

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Question:

A teacher asked Erica to solve the equation 6(P+3) = 4p+38. The steps followed are shown below: Step 1: 6p+18=4p+38 Step 2: 10p+18=38 Step 3: 10p=20 Step 4: p=2 Explain Erica’s error.

Inactive
Sireesha K.
Answer:

Yes. In step 2, Erica added 4p and 6p, but according to subtraction property of equality; 4p should be subtracted from 6p. Thus, the correct steps are: Step 1: 6p+18=4p+38 Step 2: 2p+18=38 Step 3: 2p=20 Step 4: p=10 So, the correct value of p is 10.

Subject: Basic Math

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Question:

Nylah gets $x as a pocket money for this week. She spends $1.50 for comic book, $0.75 for binder and $5.50 for a calculator. Write an expression for the amount of money left with Nylah. How would the expression change if he spends $2 more?

Inactive
Sireesha K.
Answer:

• The total expenses are $(1.50 + 0.75 + 5.50) = $7.75 So the expression $(x - 7.75) represents the amount left with Nylah. • If she spends $2 more than the expression would decrease by 2. =$(x - 7.75 - 2) =$(x - 5.75)

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